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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: sci.electronics
Subject: Re: Wireless data link
Message-ID: <7760@utzoo.UUCP>
Date: Tue, 10-Mar-87 17:18:05 EST
Article-I.D.: utzoo.7760
Posted: Tue Mar 10 17:18:05 1987
Date-Received: Tue, 10-Mar-87 17:18:05 EST
References: <214@pluto.UUCP> <250@pluto.UUCP> <175@tiger.Princeton.EDU>, <1643@kitty.UUCP>
Organization: U of Toronto Zoology
Lines: 14
Keywords: high speed, short distance

> 	Since you are referring to semiconductor lasers, such as gallium
> arsenide injection laser diodes, you don't have much choice as to the
> wavelength range of available products: 820 nanometers to somewhat less than
> 1.0 micron.  Infrared LED's are also available only in the same range.

A thought comes:  if you do end up using LEDs, you might want to consider
visible light rather than IR.  I haven't done the numbers on things like
efficiency and sensitivity, but ASSUMING THOSE ARE COMPARABLE, you will
find visible-light hardware quite a bit easier to work with during debugging.
(It's not suitable if you want your final system to be inconspicuous, of
course.)
-- 
"We must choose: the stars or	Henry Spencer @ U of Toronto Zoology
the dust.  Which shall it be?"	{allegra,ihnp4,decvax,pyramid}!utzoo!henry